I don't always tune n/a cars, but when i do, i make sure they belch black smoke - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 09-24-2013, 11:38 AM   #41
Elite Member
Thread Starter
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 783
Default

I'm guessing it's probably different from Toyota vvt-i that was around on the BEAMS motors.
concealer404 is offline   Reply With Quote
Old 09-24-2013, 11:39 AM   #42
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,640
Total Cats: 25
Default

That's exactly what it is, I can see how with small orifices that could be PWM controlled. Fair enough.

Thanks,
Dann
nitrodann is offline   Reply With Quote
Old 09-24-2013, 11:39 AM   #43
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Its probably similar to the VVT on the newer ford duratech motors.
Leafy is offline   Reply With Quote
Old 09-24-2013, 11:43 AM   #44
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,640
Total Cats: 25
Default

With small orifices slowing the change in angle and good PWM a system similar to how honda works could be used.

Fair call.

Do we know if they are tightening the LSA to get more power towards the top end?

NC is intake cam VVT only?

Dann
nitrodann is offline   Reply With Quote
Old 09-24-2013, 11:53 AM   #45
Senior Member
iTrader: (8)
 
Join Date: Jan 2012
Location: Azusa, CA
Posts: 1,376
Total Cats: 80
Default

I love how the original M.net post added estimated crank horsepower numbers. Just to make it look more impressive.



Also, bumped to third page for some cool pneumatic cam-less valvetrain.

cyotani is offline   Reply With Quote
Old 09-24-2013, 12:33 PM   #46
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,010
Total Cats: 583
Default

Thread direction change is win.
hornetball is offline   Reply With Quote
Old 09-24-2013, 03:08 PM   #47
Junior Member
 
Join Date: Nov 2009
Location: Jax Fl
Posts: 469
Total Cats: 30
Default

I found a rare clip of a m.net tuner in action




Brace yourselves for the majestic being you are about to witness














Attached Thumbnails
I don't always tune n/a cars, but when i do, i make sure they belch black smoke-0d7.gif  
Tw34k is offline   Reply With Quote
Old 09-24-2013, 03:21 PM   #48
Senior Member
 
Join Date: Sep 2013
Posts: 903
Total Cats: 59
Default

My car has a retarded tune, but at least my AFRs are above 12. (black bumper is rainbow; exhaust backfires are magic)
Dunning Kruger Affect is offline   Reply With Quote
Old 09-24-2013, 03:22 PM   #49
Elite Member
Thread Starter
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 783
Default

And that's what weirded me out the most. My MX6 is "tuned" in probably the worst way imaginable, would make most of you cringe if you saw it in person.

But even my AFRs aren't that bad.
concealer404 is offline   Reply With Quote
Old 09-24-2013, 04:28 PM   #50
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

My favorite part was the guy saying the extra fuel was to keep the cat cool. Because we all know throwing gasoline at a hot object is the best way to cool it.
thenuge26 is offline   Reply With Quote
Old 09-24-2013, 04:35 PM   #51
Crumple Zone Tester
iTrader: (7)
 
mgeoffriau's Avatar
 
Join Date: Jul 2009
Location: Jackson, MS
Posts: 7,656
Total Cats: 447
Default

Quote:
Originally Posted by thenuge26 View Post
My favorite part was the guy saying the extra fuel was to keep the cat cool. Because we all know throwing gasoline at a hot object is the best way to cool it.
HOLY **** you just inspired to invent a new thing.


E-Cool Exhaust Injector
"Keep Your Cats Cool with the E-Cool Exhaust Injector!"
mgeoffriau is offline   Reply With Quote
Old 09-24-2013, 04:48 PM   #52
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

^

1. inject exhaust into your engine with DEI.
2. inject fuel into your exhaust with EEI.
3. ???
4. Profit.
y8s is offline   Reply With Quote
Old 09-24-2013, 06:14 PM   #53
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,010
Total Cats: 583
Default



I just sprayed my monitor with Diet Pepsi. What kind of injection is that?
hornetball is offline   Reply With Quote
Old 09-24-2013, 06:36 PM   #54
Senior Member
iTrader: (8)
 
Join Date: Jan 2012
Location: Azusa, CA
Posts: 1,376
Total Cats: 80
Default

Quote:
Originally Posted by hornetball View Post


I just sprayed my monitor with Diet Pepsi. What kind of injection is that?

that would be aspartame injection.
cyotani is offline   Reply With Quote
Old 09-24-2013, 06:52 PM   #55
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

Quote:
Originally Posted by thenuge26 View Post
My favorite part was the guy saying the extra fuel was to keep the cat cool. Because we all know throwing gasoline at a hot object is the best way to cool it.
I could have sworn you throw in extra fuel to HEAT the cat. This is why cars are rich during warmup: So the cat gets to temp faster and starts working on cutting emissions sooner.
Braineack is offline   Reply With Quote
Old 09-24-2013, 09:15 PM   #56
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,640
Total Cats: 25
Default

Really? Apart from the obvious choke thing?

Are cars exempt from testing in my places for a certain time period after cold start?

Dann
nitrodann is offline   Reply With Quote
Old 09-24-2013, 09:17 PM   #57
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,199
Total Cats: 2,584
Default

no place will test a cold car ever.
has to be completely up to operating temps and most will have you idle it for like 10 minutes before even putting it on the rollers/sniffer
18psi is offline   Reply With Quote
Old 09-24-2013, 09:26 PM   #58
I'm a terrible person
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

Quote:
Originally Posted by 18psi View Post
no place will test a cold car ever.
has to be completely up to operating temps and most will have you idle it for like 10 minutes before even putting it on the rollers/sniffer
That's probably why the emissions lines are always so damn long. I can't imagine a car not being to temp by the time it makes it to the front, unless the driver is turning it off.
FRT_Fun is offline   Reply With Quote
Old 09-24-2013, 09:49 PM   #59
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,640
Total Cats: 25
Default

So why is brain mentioning extra fuel on cold start for the cat, is he being facetious?

Dann
nitrodann is offline   Reply With Quote
Old 09-24-2013, 10:05 PM   #60
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,199
Total Cats: 2,584
Default

huh?
No, he is on point: all oem cars are tuned to run relatively rich on startup to heat up the cats faster. Many newer cars even have a "smog pump" which is basically an air pump that blows into the exhaust stream or heads resulting in more crap flowing through the cats on a cold start and heating them up faster.
18psi is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Turbo 1995 Miata Low mileage Clean Tekel Cars for sale/trade 29 02-05-2016 05:16 PM
Mystery Engine Trouble. Halp, mt.net! vehicular General Miata Chat 12 09-14-2015 04:17 PM
Now shipping NC MX-5 (2006-15) Precision Sliding Seat Mounts FAB Fab9 Tuning - Miata Performance Parts 0 09-11-2015 01:02 PM
New here, saying hi, here's what I'm workin with. SuperSneakySecretSquirrel Meet and Greet 5 09-06-2015 09:30 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:21 AM.